Our Best Tips for Insulating Exterior walls during renovations - It's Essential not to add an additional vapor barrier and trap moisture inside walls. Read more here for help choosing the right type of insulation and how to fix it easily.

Insulate your exterior walls with confidence using these helpful tips.

Our Best Tips for Insulating Exterior walls during renovations - It's Essential not to add an additional vapor barrier and trap moisture inside walls. Read more here for help choosing the right type of insulation and how to fix it easily.

Guide describing how to apply an air control layer directly over existing wall sheathing and cover with two layers of insulating sheathing held in place by vertical furring strips.

I spend a lot of time studying insulation--which is one of the most important components of any green home or commercial building. I have a new favorite. Foamglas® building insulation has been made by Pittsburgh Corning for many decades and is widely used in Europe. For the past decade or two, however, it has only been actively marketed in North America for industrial applications. (It’s been listed in our GreenSpec Directory as an industrial insulation material for years.)

Cement coatings can provide an attractive cover for foam foundation insulation. But use metal or plastic reinforcing if you want the cement finish to last.

Regretting the decision of not insulating your home enough? Yielding high energy bills? Feeling too cold or too humid inside your house?

Learn the best way to insulate an old house from the outside improve energy efficiency and save money

Gregg is renovating his 50-year-old house in Wisconsin and trying to devise the best way of insulating exterior walls from the outside. The house was built conventionally, with 2x4 walls, fiberglass batt insulation, fiberboard sheathing, and hardboard siding. He plans to tear off both siding and sheathing and remove the batt insulation, then apply 3 in. of spray polyurethane foam insulation into the stud bays. The existing kraft paper vapor barrier on the interior side of the wall will stay…